Did you know the cable cars have their own website (separate from the rest of MUNI)? Besides route maps it offers cable car history, interactive demos, even guidelines for hopping on and off.
B in the D, when I lived in Cow Hollow near the Marina, I commuted by cable car for a while. Back then residents as well as tourists rode cables car lines. Now they are more expensive that buses and streetcars, and have become basically a novelty ride for tourists.